1.3.5.2 Determiners
In the first sentence, we introduce the main aspects of the story: the man and the ‘shop’ situation. In this sentence the two nouns man and shop are preceded by the determiner a. This is the indefinite article and one of its functions is to signal new information that has not been mentioned previously. In the next sentence we have two more nouns shopkeeper and man (again). This time they are preceded by the determiner the, which is the definite article. Its function is to indicate information which has already been given and, therefore, to connect a series of sentences as being about the same thing. Thus, the shopkeeper is assumed to be the shopkeeper of the shop mentioned in the previous sentence, not another one round the corner, and the man is assumed to be the one who we have just been informed has walked into the shop, not one who was already in the shop, for example.